Excavator bucket tooth



1954 w. w. EVERETT 2,666,272

EXCAVATOR BUCKET TOOTH Filed Oct. 16, 1950 Gttomeg Patented Jan. 19, 1954 r,

mesneassignments, to Earth Equipment Corporation, Los Angeles, Calif., acorporatlon of California I Application October 16, 1950, Serial No. 190,407' I This invention pertains to excavating machinery, and more particularly is directed to improvements in excavator bucket teeth.

One of the objects of this invention is to providean improved tooth for an excavator bucket which has a removable and replaceable t1p.

Still another object of the present invention is to provide a removable tooth which is automatically held in place without the use of auxiliary fastening devices.

It is a still further object of this invention to provide a removable tooth arrangement for an excavator bucket in which the tooth tip may be driven home on a supporting tip fixed to the bucket and automatically held in locked position thereon by a resilient locking portion of the tooth tip and which may be readily removed by light tapping of said resilient holding member at a particular point.

A still further object of this invention is to provide an improved demountable tooth tip for an excavator bucket which automatically locks itself in position on the bucket and which holds itself with increasing rigidity when load is imposed upon the tooth tip during the digging operation.

Further features and advantages of this invention will appear for a detailed description of the drawings in which:

Fig. 1 is a side view of an excavator bucket tooth incorporating the features of this invenin Fig. 2.

. Fig. 5 is a front elevation of the demountable tooth tip shown in Fig. 1.

4 Claims. (01.37-142) 2 bottom [2 of the bucket I0 is mounted the tooth 'base support member l6' by its surface I! and suitably welded in place at l 8.

The outer end of the toothbase member I6 is formed with a truncated conical surface I9 whose axis 20 is eccentric to the main axis 2| of the semi-cylindrical body portion 22 of the member It. The taperportion I!) has a tapered surface 23 converging toward the smaller pointed end 19a of the tooth base member l6.

The demountable tooth which may be placed on and removed from the support member 16 comprises the main plate member 24 havin the cutting edge 25 formed by asuitablebevelsurface 26 on its outer end. To the outer face 21 is formed the conical tapered member 28 having the inside semi-cylindrical surface 29 and the angular cut surface 30 so as tov form a truncated conical aperture or socket 3! in the member 28 between the surfaces 21 of the tooth 24 and the semi-cylindrical surface 29 of the member 28. The member 28 may be formed as an integral forged or cast part of the member 24 or as an individual piece which is suitably welded at 32 to the surface 21 of the demountable tooth plate member 24.

The rear end of the member 24 is provided with an opening or hole 32 and is bent up at 33 at a substantial angle to the portion 24a of the vmember 24 so as to form a locking clip portion 24b on the member 24.-

In order to facilitate proper seating and guiding of the tooth member 24 when placed on the tooth base support member Hi, the member I6 is provided with a flattened guide surface 34 which .24 inside of the member 28 as best seen in Fig. 9.

Fig. 6 is a side view of the demountable tooth tip shown in Fig. 5.

Fig. '7 is a bottom view of the demountable toothtip shown in Figs. 1, 5, and 6.

Fig. 8 is a front assembled view of the improved demountable tooth mechanism incorporating the features of this invention.

Fig. 9 is a sectional view on the line 9-9 of Fig.8.

For exemplary purposes this invention is shown pivot point at 33. During the workingoperation the s .Teihese ide sur 1. 11 h ,The member l6 also enters diagonally through the opening 32 in the portion 24b of the tooth 24-, the angularityofthe member 24b being such that the edge 35 of the opening 32 is held firmly .and resiliently against the surface 36 of the member l6 as the tooth 24 is finally driven home with full engagement of the tapered portion I9 of 'the member [6 in the tapered opening 3| in the member 28 as best seen in Fig. 9. Under these conditions the member 24b is slightly sprung in the direction'indicatedby the arrow 31 so as to maintain theaformentioned resilient contact of the edge 35with the surface 36 of the member it, the member 24 bending around a of the tooth and bucket the force exerted against the cutting edge 25 in the direction indicated by the arrow 38 firmly holds the tooth 24 on the tapered .-D9rtion l9. :of the member I6. Other forces exerted in the direction indicated by the arrow 39 during the digging operation are com-.- pletely absorbed by the surface 34 of the member l6 abutting against the surface 21 of the tooth member 24 so t the harder wo k e2;- erted oh the tooth the e fi m y t h held against the supporting member 16.

Further, the tooth 24 cannot be pulled or other: A

wise withdrawn from the member it because when it is attempted to pull the tooth 2i the opposite direction to that indicated by the arrow 38, the edge 35 in resilient contact with .the guy,- face 36 of the member l6 W111 #8 356 the member 2412 to swing in the direction indicated by the arrow 40 which further increases the pressure at the point 35 to cause the member 2419 and the tooth 2i to be firmly locked against aerial dis.-v placement from the member I6. Thus an automat locking means elfeohtaihed wi hin th tooth itself has bee provided for se urely holding the tooth to the member without the u e of auxil ary h ldin o iastehing m a It is o he further noted, howeve tha by strik n readily e released and the tooth immediately and uickly .remored- The e is thus p ov ded demountable toot which is au omatically h d Lh Position on th bucktsupoort m mber tor e to th with ut the use of auxi iar hol in means and which becomes more firmly h ld in iece 4c of he member 34 term a substantially emooth etrei ht path of soil movement into the bucket I0 as indicated by the arrow 13 .ee as toor vi e hichoperotic emcien y with a minimum o power requirement,-

Having thus fully set forth and described my invention what is claimed as new and desired to be secured by United States Letters Patentsis:

1. An excavator bucket tooth device for an excavator bucket comprising a support member fixed to said bucket, a tapered truncated conical portion formed on said support member, a fiattencd surface on one side of said support member facing in the direction of digging force applied to said device, a demountable tooth comprising a plate member, a tip on the outer end of said plate member, -a truncated conical socket portion formed on the opposite side of said plate member from the surface thereof facing in the direction of digging force and engaging over said truncated conical portion of said support member, the rear surface of said plate member engaging h flattened eur a e on a d upp rt member, a resilient iocki-ng member inclined away from the digging face of said tip in the direction of said truncated conical socket portion, having an opening through which said support member projects into said truncated conical socket portion, and a locking edge on said resilient locking portion enaging said support member on the opposite side 7 from said flattened surface thereof. 2. In a demountable tooth for an excavator bucket having asupport member fixed to the 75 *2 ,427,651-

t e mem er 34b on the edge 4 in the dire tion indicated by t e arrow AZ that the member Z 4 bucket, a semi-cylindrical projecting portion on said support member terminating in a truncated conical portion having an axis offset from said semi-cylindrical portion in the direction of digging force applied to said demountable tooth, a flattened surface on said semiecylindrical portion extending through said truncated conical portion and facing in said direction of digging force, a demountable tooth tip comprising a plate member having its rear surface facing in the opposite d ec ion relative to Said direction of die- ;QIM Engagement with said flattened surface adjacent said truncated conical portion of said supportmember, a truncated conical socket formed on said rear surface of said tooth tip matingly engaging over said truncated conical portion of said support member, and an integral inclined portion on saigcl plate member of said tip therein for insertiongi said support member .the et rough with t runcated o ical end po t on i s id sock t memb r and h ng a ckin edge engaging said supp rt member o t e p site s de here f from said flatt n d po tion to rigid y hold said. tip on .said upp t m mb I 3. ,In' anexcavator bucket tooth structure for an excavator bucket, a support member rigidly s cured to the bu ket, a tapered e d p rtion formed on said. supportmember, a flat surface on one po tio of said taper-ed portion facin i the dir ction of dig ing m ve e t a p to sa d bucket o th structur .a demountabl tooth tip comp s ng a p ate member hav ng a ea u face engaging said flattened surf ce and havin a truncated conical socket enga in e said tapered end portion of said support member, a bent lowe edg on sa d plat membe defl d toward the s de of said t u cated n c socket including a bore formed therethr gh to pas age of sa d euphoria m mbe the e hroueh nt said a locking edge said he e en a in said support memb r on the op osi e side from said flattened surface thereof to automatically lock s id t p on said member- A. In an impro ed excavator bucket teeth of the demountable type for an excavator bucket having a main Sup or member fixed to the bucket-a t pe ed end porti n formed thereon, a removable tip including a cutting edge plate member, a runcated c n c l s cket formed on the rear fac -of ai p ate r cr ber adapted to engage over the tapered portion of said support member to provide the .sole means f r ri idly supportin the tooth on said support member on said bucket, a spring leckdcvice formed on the other end of said plate member from its cutting edge end by an a gularly disposed portion of said plate member, a passageway formed in said angula-rly disposed 13911121011 opening in front of'the open end of said socket portion, and a locking edge in said opening engaging said supporting member to resiliently hold said truncated conical socket in eng gement with said tapered end portion of said support member;

OQDROW W, EVER TT- .Eefcremes Qitcd in the .fileof this patent UNITED STATES PATENTS Number 'Name Date 895,475 Dow t -j Aug. 11, 1908 2,238,081 Soberanes Apr--15, 9.4,].

' 'Baer Sept. 23, 1947 

